$20 is not out of the norm, $20-$30 is the standard for expansion packs. The only dissapointing thing about this annoucement is that Steam, being a digital distribution service, decided to stick to that norm.

The point of buying through Steam seems a bit mute when the only advantage is getting the product a day earlier than from the store shelf.

I guess thats hypothetical though since I don't know whether this is a Steam exclusive release or not.

As others have said no one really hated Postal 2 for its subject matter, its that the gameplay sucked hard. Make the combat mildly entertaining this time RWS and you might turn Postal into a fun franchise again.